我是Go的新手。假设我有一个服务器正在侦听HTTP请求,同时我需要检查Redis通知,以便我可以更新数据。以下是一个例子:
func checkExpire() {
for {
switch msg := pubSubConn.Receive().(type) {
case redis.Message:
...
}
}
server.ListenAndServe()
简单地将checkExpire
放入goroutine是一个很好的解决方案吗?
go func() {
for {
switch msg := pubSubConn.Receive().(type) {
case redis.Message:
...
}
}()
答案 0 :(得分:10)
是的,请记住warning: unsequenced modification and access to 'i' [-Wunsequenced]
也是goroutine,这是工作代码:
undef.c: In function ‘main’:
undef.c:7:24: warning: operation on ‘i’ may be undefined [-Wsequence-point]
s1[i] = s1[++i];
^~~
运行代码并打开browser。
永远不要使用空循环(main
)看:
Difference between the main goroutine and spawned goroutines of a Go program
空循环使用100%的CPU核心,根据您可能使用的用例等待某些操作:
- package main
import (
"fmt"
"net/http"
"time"
)
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
}
func checkExpire() {
for {
// do some job
fmt.Println(time.Now().UTC())
time.Sleep(1000 * time.Millisecond)
}
}
func main() {
go checkExpire()
http.HandleFunc("/", handler) // http://127.0.0.1:8080/Go
http.ListenAndServe(":8080", nil)
}
,如this
- for{}
,如this
- 频道
- sync.WaitGroup